using BuildFlow.Application.AiModel.Commands;
using BuildFlow.Application.AiModel.Handlers;
using BuildFlow.Domain.Entities.AiModel;
using BuildFlow.Domain.Enums;
using BuildFlow.Infrastructure.Persistence;
using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.Rag.Tests;

/// <summary>
/// 更新 AI 模型处理器测试。成功路径 + 不存在/参数校验异常分支。
/// </summary>
public class UpdateAiModelCommandHandlerTests
{
    [Fact]
    public async Task Handle_ExistingModel_UpdatesFields()
    {
        await using var db = CreateDb();
        var modelId = Guid.NewGuid();
        db.AiModels.Add(new AiModelEntity
        {
            Id = modelId,
            Name = "Qwen",
            Provider = ModelProviderEnum.LMStudio,
            ModelId = "qwen2.5",
            BaseUrl = "http://localhost:1234/v1",
            ApiKey = "lm-studio",
            ModelType = ModelTypeEnum.Chat,
            IsActive = true,
            CreatedBy = "test",
            UpdatedBy = "test",
            OperatorIP = "127.0.0.1",
        });
        await db.SaveChangesAsync();

        var handler = new UpdateAiModelCommandHandler(db);
        var command = new UpdateAiModelCommand(
            modelId,
            "Qwen-Updated",
            (int)ModelProviderEnum.OpenAI,
            "qwen3",
            "https://api.openai.com/v1",
            null,
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            "系统提示词");

        var result = await handler.Handle(command, CancellationToken.None);

        result.Name.Should().Be("Qwen-Updated");
        result.ModelId.Should().Be("qwen3");
        result.IsActive.Should().BeFalse();
        var persisted = await db.AiModels.FindAsync(modelId);
        persisted!.Name.Should().Be("Qwen-Updated"); // 前面已断言存在
        // ApiKey 传 null 时保留原值
        persisted.ApiKey.Should().Be("lm-studio");
    }

    [Fact]
    public async Task Handle_NotFound_ThrowsNotFound()
    {
        await using var db = CreateDb();
        var handler = new UpdateAiModelCommandHandler(db);
        var command = new UpdateAiModelCommand(
            Guid.NewGuid(),
            "Qwen",
            (int)ModelProviderEnum.OpenAI,
            "qwen3",
            "https://api.openai.com/v1",
            null,
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            null);

        var act = async () => await handler.Handle(command, CancellationToken.None);
        var ex = await act.Should().ThrowAsync<NotFoundException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }

    [Fact]
    public async Task Handle_InvalidProvider_ThrowsInvalidParam()
    {
        await using var db = CreateDb();
        var modelId = Guid.NewGuid();
        db.AiModels.Add(new AiModelEntity
        {
            Id = modelId,
            Name = "Qwen",
            Provider = ModelProviderEnum.LMStudio,
            ModelId = "qwen2.5",
            BaseUrl = "http://localhost:1234/v1",
            ApiKey = "lm-studio",
            ModelType = ModelTypeEnum.Chat,
            CreatedBy = "test",
            UpdatedBy = "test",
            OperatorIP = "127.0.0.1",
        });
        await db.SaveChangesAsync();

        var handler = new UpdateAiModelCommandHandler(db);
        var command = new UpdateAiModelCommand(
            modelId,
            "Qwen",
            999,
            "qwen3",
            "https://api.openai.com/v1",
            null,
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            null);

        var act = async () => await handler.Handle(command, CancellationToken.None);
        var ex = await act.Should().ThrowAsync<BusinessException>();
        ex.Which.Code.Should().Be(ErrorCode.InvalidParam);
    }

    private static RagDbContext CreateDb()
    {
        var options = new DbContextOptionsBuilder<RagDbContext>()
            .UseInMemoryDatabase($"rag-update-aimodel-{Guid.NewGuid():N}")
            .Options;
        var db = new RagDbContext(options);
        db.SavingChanges += (_, _) => RagTestDb.FillAudit(db);
        return db;
    }
}